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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 373 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 103 + 295 + 204? (a) 700 (b) 800 (c) 600 (d) 500
  2. 2.Which is closest to 2398 ÷ 29? (a) 80 (b) 40 (c) 800 (d) 160
  3. 3.Round 55.12 to one decimal place. =
  4. 4.Round 5213 to the nearest thousand.
  5. 5.Which is closest to 498 × 59? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  6. 6.Which is closest to 96 + 200 + 396? (a) 700 (b) 800 (c) 600 (d) 900
  7. 7.Round 30.64 to one decimal place. =
  8. 8.Which is closest to 696 + 499 + 503? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  9. 9.Which is closest to 700 × 29? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  10. 10.Round 23.08 to one decimal place. =
  11. 11.Round 95.19 to one decimal place. =
  12. 12.Which is closest to 596 + 500 + 805? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  13. 13.Which is closest to 896 + 702 + 903? (a) 2700 (b) 2600 (c) 2500 (d) 2400
  14. 14.Round 66383 to the nearest hundred.
  15. 15.Which is closest to 897 + 804 + 196? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  16. 16.Which is closest to 604 + 96 + 598? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  17. 17.Round 61426 to the nearest ten.
  18. 18.Round 97.83 to one decimal place. =
  19. 19.Round 42.94 to one decimal place. =
  20. 20.Which is closest to 2704 ÷ 29? (a) 900 (b) 90 (c) 180 (d) 45
  21. 21.Round 85.34 to one decimal place. =
  22. 22.Round 70468 to the nearest ten.
  23. 23.Round 46861 to the nearest ten.
  24. 24.Which is closest to 503 × 29? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  25. 25.Which is closest to 698 × 18? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  26. 26.Round 81506 to the nearest ten.
  27. 27.Round 33.76 to one decimal place. =
  28. 28.Round 46923 to the nearest ten.
  29. 29.Which is closest to 4000 ÷ 51? (a) 40 (b) 160 (c) 80 (d) 800
  30. 30.Which is closest to 498 × 29? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  31. 31.Which is closest to 800 + 704 + 795? (a) 2500 (b) 2400 (c) 2200 (d) 2300
  32. 32.Round 36463 to the nearest thousand.
  33. 33.Round 75709 to the nearest thousand.
  34. 34.Which is closest to 1200 ÷ 31? (a) 400 (b) 20 (c) 80 (d) 40
  35. 35.Round 42306 to the nearest thousand.
  36. 36.Which is closest to 205 + 295 + 404? (a) 1000 (b) 800 (c) 1100 (d) 900
  37. 37.Which is closest to 796 × 81? (Round each number first.) (a) 64000 (b) 128000 (c) 640000 (d) 6400
  38. 38.Which is closest to 495 + 496 + 400? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  39. 39.Round 46140 to the nearest hundred.
  40. 40.Which is closest to 902 + 204 + 402? (a) 1700 (b) 1400 (c) 1500 (d) 1600

Answer key

  1. 600
  2. 80
  3. 55.1
  4. 5000
  5. 30000
  6. 700
  7. 30.6
  8. 1700
  9. 21000
  10. 23.1
  11. 95.2
  12. 1900
  13. 2500
  14. 66400
  15. 1900
  16. 1300
  17. 61430
  18. 97.8
  19. 42.9
  20. 90
  21. 85.3
  22. 70470
  23. 46860
  24. 15000
  25. 14000
  26. 81510
  27. 33.8
  28. 46920
  29. 80
  30. 15000
  31. 2300
  32. 36000
  33. 76000
  34. 40
  35. 42000
  36. 900
  37. 64000
  38. 1400
  39. 46100
  40. 1500

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